Double-acting drill bit



' Aug. 22, 1950 F. G. TURNER 2,519,861 I DOUBLE-ACTING DRILL BIT,

Filed Jan. 14, 1947 I N VEN TOR.

Frargl}. Turner ATTD RN EYE Patented Aug. 22, 1950 UNITED STATES PATENT" OFFICE M I I 2,519,861 7 v DOUBLE-ACTING DRILL BIT Frank G. Turner, Twin Falls, Idaho, assignor, by direct and mesne assignments, of nine-twentieths to John D. Bilbao and two-twentieths to Harry Povey, both of Twin Falls, Idaho Application January 14, 19-47, Serial No. 722,003

I My present invention relates generally to earth boring tools, and more specifically to an improved double acting drill bit of the type havingan impact or vibratorystroke and rotary action, for drilling wells and similar earth drilling or boring operations.

As iswell known to those'familiar with boring, fragments of-rock from the wall of the hole being drilled, and other undesirable materials, frequently fall into the hole as it is being drilled, and lodge on top of the bit and within the wall of the hole. This excess material becomes wedged in the hole above the bit, impedes the operation of the bit, and frequently results in loss and abandonment of the bit due to the inability of the operator to extricate the bit from the jammed material.

The primary purpose of my invention is the provision of a bit that is capable of cutting itself clear of such excess material as the bit is being removed from the hole; and to this end the bit of my invention is equipped with double acting cutters, including a set of auxiliary cutters designed for action in breaking and pulverizing any excess material lodged above the bit. This action is attained by elevating the drive shaft and the bit mounted thereon, and the resulting debris may be disposed of in usual manner.

The invention consists in certain novel features of construction and combinations and arrangements of parts as will hereinafter be described and more specifically pointed out in the appended claim.

In the accompanying drawings I have illustrated one complete example of a physical embodiment of my invention wherein the parts are combined and arranged in accord with one mode I have devised for the practical application of the principles of my invention. It will however, be understood that changes and alterations are contemplated and may be made in these exemplifying drawings and mechanical structures within the scope of my claim, without departing from the principles of the invention.

Figure 1 is a top plan view of a drill bit in which my invention is embodied.

Figure 2 is a side view of the drill bit; and Figure 3 is a bottom plan view of the bit.

Figure 4 is a side view of the bit as seen from line l4 of Fig. 1.

Figure 5 is a central vertical sectional view of the bit; and Figure 6 is a perspective view of the bit of my invention.

In carrying out my invention I employ an integral bit, or bit stock, of generally cylindrical 1 Claim. (CL 255-64) shape and fashioned of tool steel, with an upper cylindrical central collar I that is internally threaded to form an attaching socket for-a conventional tubular drive shaft 2 which is shown in dotted lines in Figs. 2 and 4. I

The tubular steel drive shaft in-addition to operating the bit, is designed to convey air and water under pressure to the bit, and the latter is fashioned with a laterally extending conduit or duct 3 from the bottom of the socket which terminates in a discharge port 4 for blowing out the powdered rock and other debris resulting from the impact or vibratory strokes and the rotary action of the drill hit.

As here shown the integral bit stock or body is equipped with four circumferentially spaced lobes 5, each having an outer segmental or arcuate face conforming to the annular wall of the hole being drilled, and these four lobes form diametrically arranged vertical recesses, flutes, or grooves 6 for upward movement of the debris as it is cleared from beneath the bit.

Each lobe, at its lower end, terminates in a radially extending main cutter or cutting edge I, and these four diametrically arranged cutters merge with the walls of a central clearance recess 9 of rectangular shape located in the working face of the tool.

In addition to the main cutters, each lobe 5, at its upper portion is formed with two acutely arranged angular faces that'merge to provide a horizontally extending radial auxiliary cutter or cutting edge [0, and these auxiliary cutters, adapted to cut upwardly, extend inwardly from the outer convex faces of the lobes to the exterior surface of the collar l.

The auxiliary cutters or cutting edges are shorter than the main cutters, and the auxiliary cutters have less width than the main cutters; but all of the cutters have the same overall exterior diameter that permits ready withdrawal of the tool from a bored hole.

Between the circumferentially spaced auxiliary cutters clearance spaces are provided over the main cutters into which spaces debris from the grooves or channels 6 flows, upwardly, and exterior ribs H arranged vertically on the collar above the channels, divide and aid in clearing the debris on its way up through the bored hole exterior of the drive shaft.

From this description taken in connection with my drawings it will be apparent that, in it's drilling operation as it vibrates or reciprocates with a rotary action, the bit is effective in pulverizing rock and other hard materials and in disposing of the debris in usual manner. In the drilling operations the auxiliary cutters on the upper parts of the lobes tend to clear the material flowing upwardly from the bit, and to prevent clogging or jamming of the bit. Should, however, excess material above the bit and within the bored :hole mecomelodged orwedged-over the bit and .in -.the bored hole, thebit .may be activated with upward strokes for dislodging any accumulated material that would impede removal of the bit fromthe bored hole.

Having thus fully described my invention what I claim as new and desire to .secure byrLetters Patent is:

In a drill bit, a body provideii with eantupper cylindrical collar, said collar being threaded interiorly to define an attachingsocket there being a laterally extending duct leading from said socket, a plurality of circumferentially spaced arcuate lobes arranged :Im the exterior of said body, said lobes having a .smooth iextenior :surface lying in a.circle of a commonradiuspsaid lobes defining spaced, parallel :grooves therebetween, the :lower :end 0faCh1Of :said lobes terminating in a main cutting sedge, said main nutting "edges extending radially of zthB longi- .tudinal a-xis of the :bit, lthe inner portion at the main .cutting edges being cut :away :to define -a :rality of spaced parallel vertically disposed ribs arranged on the exterior of said collar, said ribs being positioned intermediate the auxiliary cutters.

FRANK G. TURNER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number .Name Date 54,199 Palmer Apr.l4,1866 54,226 Smith .Apr. 24, .1866

658,060 \Dudley .Sept. 18,1900 :80 3;9L1 iLeymer ..Nov. 7, 19 05 1,859,342 Rez ,May 24, 1932 2,368,512 Zimmerman .Jan...30, 1945 2,499,282 Roberts Feb. 28, .1950 

